/*!
    SlickNav Responsive Mobile Menu
    (c) 2014 Josh Cope
    licensed under MIT
*/
;(function ($, document, window) {
    var
    // default settings object.
    defaults = {
        label: 'BONANZOOKA',
        duplicate: true,
        duration: 200,
        easingOpen: 'swing',
        easingClose: 'swing',
        closedSymbol: '&#9658;',
        openedSymbol: '&#9660;',
        prependTo: 'body',
        parentTag: 'a',
        closeOnClick: false,
        allowParentLinks: false,
        nestedParentLinks: true,
        showChildren: false,
        init: function(){},
        open: function(){},
        close: function(){}
    },
    mobileMenu = 'slicknav',
    prefix = 'slicknav';
    
    function Plugin( element, options ) {
        this.element = element;

        // jQuery has an extend method which merges the contents of two or
        // more objects, storing the result in the first object. The first object
        // is generally empty as we don't want to alter the default options for
        // future instances of the plugin
        this.settings = $.extend( {}, defaults, options) ;
        
        this._defaults = defaults;
        this._name = mobileMenu;
        
        this.init();
    }
    
    Plugin.prototype.init = function () {
        var $this = this;
        var menu = $(this.element);
        var settings = this.settings;
        
        // clone menu if needed
        if (settings.duplicate) {
            $this.mobileNav = menu.clone();
            //remove ids from clone to prevent css issues
            $this.mobileNav.removeAttr('id');
            $this.mobileNav.find('*').each(function(i,e){
                $(e).removeAttr('id');
            });
        }
        else
            $this.mobileNav = menu;
        
        // styling class for the button
        var iconClass = prefix+'_icon';
        
        if (settings.label === '') {
            iconClass += ' '+prefix+'_no-text';
        }
        
        if (settings.parentTag == 'a') {
            settings.parentTag = 'a href="#"';
        }
        
        // create menu bar
        $this.mobileNav.attr('class', prefix+'_nav');
        var menuBar = $('<div class="'+prefix+'_menu"></div>');
        $this.btn = $('<'+settings.parentTag+' aria-haspopup="true" tabindex="0" class="'+prefix+'_btn '+prefix+'_collapsed"><span class="'+prefix+'_menutxt">'+settings.label+'</span><span class="'+iconClass+'"><span class="'+prefix+'_icon-bar"></span><span class="'+prefix+'_icon-bar"></span><span class="'+prefix+'_icon-bar"></span></span></a>');
        $(menuBar).append($this.btn);        
        $(settings.prependTo).prepend(menuBar);
        menuBar.append($this.mobileNav);
        
        // iterate over structure adding additional structure
        var items = $this.mobileNav.find('li');
        $(items).each(function () {
            var item = $(this);
            var data = {};
            data.children = item.children('ul').attr('role','menu');
            item.data("menu", data);
            
            // if a list item has a nested menu
            if (data.children.length > 0) {
            
                // select all text before the child menu
                // check for anchors
                
                var a = item.contents();
                var containsAnchor = false;
                
                var nodes = [];
                $(a).each(function(){
                    if(!$(this).is("ul")) {
                        nodes.push(this);
                    }
                    else {
                        return false;
                    }
                    
                    if($(this).is("a")) {
                        containsAnchor = true;
                    }
                });
                
                var wrapElement = $('<'+settings.parentTag+' role="menuitem" aria-haspopup="true" tabindex="-1" class="'+prefix+'_item"/>');
                
                // wrap item text with tag and add classes unless we are separating parent links
                if ((!settings.allowParentLinks || settings.nestedParentLinks) || !containsAnchor) {
                    var $wrap = $(nodes).wrapAll(wrapElement).parent();
                    $wrap.addClass(prefix+'_row');
                } else
                    $(nodes).wrapAll('<span class="'+prefix+'_parent-link '+prefix+'_row"/>').parent();
                
                item.addClass(prefix+'_collapsed');
                item.addClass(prefix+'_parent');
                
                // create parent arrow. wrap with link if parent links and separating
                var arrowElement = $('<span class="'+prefix+'_arrow">'+settings.closedSymbol+'</span>');
                
                if (settings.allowParentLinks && !settings.nestedParentLinks && containsAnchor)
                    arrowElement = arrowElement.wrap(wrapElement).parent();
                
                //append arrow
                $(nodes).last().after(arrowElement);
                
            
            } else if ( item.children().length === 0) {
                 item.addClass(prefix+'_txtnode');
            }
            
            // accessibility for links
            item.children('a').attr('role', 'menuitem').click(function(event){
                //Emulate menu close if set
                //Ensure that it's not a parent
                if (settings.closeOnClick && !$(event.target).parent().closest('li').hasClass(prefix+'_parent'))
                    $($this.btn).click();
            });
            
            //also close on click if parent links are set
            if (settings.closeOnClick && settings.allowParentLinks) {
                item.children('a').children('a').click(function(event){
                    //Emulate menu close
                        $($this.btn).click();
                });
                
                item.find('.'+prefix+'_parent-link a:not(.'+prefix+'_item)').click(function(event){
                    //Emulate menu close
                        $($this.btn).click();
                });
            }
        });
        
        // structure is in place, now hide appropriate items
        $(items).each(function () {
            var data = $(this).data("menu");
            if (!settings.showChildren){
                $this._visibilityToggle(data.children, null, false, null, true);
            }
        });
        
        // finally toggle entire menu
        $this._visibilityToggle($this.mobileNav, null, false, 'init', true);
        
        // accessibility for menu button
        $this.mobileNav.attr('role','menu');
        
        // outline prevention when using mouse
        $(document).mousedown(function(){
            $this._outlines(false);
        });
        
        $(document).keyup(function(){
            $this._outlines(true);
        });
        
        // menu button click
        $($this.btn).click(function (e) {
            e.preventDefault();
            $this._menuToggle();
        });
        
        // click on menu parent
        $this.mobileNav.on('click', '.'+prefix+'_item', function(e){
            e.preventDefault();
            $this._itemClick($(this));
        });
        
        // check for enter key on menu button and menu parents
        $($this.btn).keydown(function (e) {
            var ev = e || event;
            if(ev.keyCode == 13) {
                e.preventDefault();
                $this._menuToggle();
            }
        });
        
        $this.mobileNav.on('keydown', '.'+prefix+'_item', function(e) {
            var ev = e || event;
            if(ev.keyCode == 13) {
                e.preventDefault();
                $this._itemClick($(e.target));
            }
        });
        
        // allow links clickable within parent tags if set
        if (settings.allowParentLinks && settings.nestedParentLinks) {
            $('.'+prefix+'_item a').click(function(e){
                    e.stopImmediatePropagation();
            });
        }
    };
    
    //toggle menu
    Plugin.prototype._menuToggle = function(el){
        var $this = this;
        var btn = $this.btn;
        var mobileNav = $this.mobileNav;
        
        if (btn.hasClass(prefix+'_collapsed')) {
            btn.removeClass(prefix+'_collapsed');
            btn.addClass(prefix+'_open');
        } else {
            btn.removeClass(prefix+'_open');
            btn.addClass(prefix+'_collapsed');
        }
        btn.addClass(prefix+'_animating');
        $this._visibilityToggle(mobileNav, btn.parent(), true, btn);
    };
    
    // toggle clicked items
    Plugin.prototype._itemClick = function(el) {
        var $this = this;
        var settings = $this.settings;
        var data = el.data("menu");
        if (!data) {
            data = {};
            data.arrow = el.children('.'+prefix+'_arrow');
            data.ul = el.next('ul');
            data.parent = el.parent();
            //Separated parent link structure
            if (data.parent.hasClass(prefix+'_parent-link')) {
                data.parent = el.parent().parent();
                data.ul = el.parent().next('ul');
            }
            el.data("menu", data);
        }
        if (data.parent.hasClass(prefix+'_collapsed')) {
            data.arrow.html(settings.openedSymbol);
            data.parent.removeClass(prefix+'_collapsed');
            data.parent.addClass(prefix+'_open');
            data.parent.addClass(prefix+'_animating');
            $this._visibilityToggle(data.ul, data.parent, true, el);
        } else {
            data.arrow.html(settings.closedSymbol);
            data.parent.addClass(prefix+'_collapsed');
            data.parent.removeClass(prefix+'_open');
            data.parent.addClass(prefix+'_animating');
            $this._visibilityToggle(data.ul, data.parent, true, el);
        }
    };

    // toggle actual visibility and accessibility tags
    Plugin.prototype._visibilityToggle = function(el, parent, animate, trigger, init) {
        var $this = this;
        var settings = $this.settings;
        var items = $this._getActionItems(el);
        var duration = 0;
        if (animate)
            duration = settings.duration;
        
        if (el.hasClass(prefix+'_hidden')) {
            el.removeClass(prefix+'_hidden');
            el.slideDown(duration, settings.easingOpen, function(){
                
                $(trigger).removeClass(prefix+'_animating');
                $(parent).removeClass(prefix+'_animating');
                
                //Fire open callback
                if (!init) {
                    settings.open(trigger);
                }
            });
            el.attr('aria-hidden','false');
            items.attr('tabindex', '0');
            $this._setVisAttr(el, false);
        } else {
            el.addClass(prefix+'_hidden');
            el.slideUp(duration, this.settings.easingClose, function() {
                el.attr('aria-hidden','true');
                items.attr('tabindex', '-1');
                $this._setVisAttr(el, true);
                el.hide(); //jQuery 1.7 bug fix
                
                $(trigger).removeClass(prefix+'_animating');
                $(parent).removeClass(prefix+'_animating');
                
                //Fire init or close callback
                if (!init)
                    settings.close(trigger);
                else if (trigger == 'init')
                    settings.init();
            });
        }
    };

    // set attributes of element and children based on visibility
    Plugin.prototype._setVisAttr = function(el, hidden) {
        var $this = this;
        
        // select all parents that aren't hidden
        var nonHidden = el.children('li').children('ul').not('.'+prefix+'_hidden');
        
        // iterate over all items setting appropriate tags
        if (!hidden) {
            nonHidden.each(function(){
                var ul = $(this);
                ul.attr('aria-hidden','false');
                var items = $this._getActionItems(ul);
                items.attr('tabindex', '0');
                $this._setVisAttr(ul, hidden);
            });
        } else {
            nonHidden.each(function(){
                var ul = $(this);
                ul.attr('aria-hidden','true');
                var items = $this._getActionItems(ul);
                items.attr('tabindex', '-1');
                $this._setVisAttr(ul, hidden);
            });
        }
    };

    // get all 1st level items that are clickable
    Plugin.prototype._getActionItems = function(el) {
        var data = el.data("menu");
        if (!data) {
            data = {};
            var items = el.children('li');
            var anchors = items.find('a');
            data.links = anchors.add(items.find('.'+prefix+'_item'));
            el.data("menu", data);
        }
        return data.links;
    };

    Plugin.prototype._outlines = function(state) {
        if (!state) {
            $('.'+prefix+'_item, .'+prefix+'_btn').css('outline','none');
        } else {
            $('.'+prefix+'_item, .'+prefix+'_btn').css('outline','');
        }
    };
    
    Plugin.prototype.toggle = function(){
        var $this = this;
        $this._menuToggle();
    };
    
    Plugin.prototype.open = function(){
        var $this = this;
        if ($this.btn.hasClass(prefix+'_collapsed')) {
            $this._menuToggle();
        }
    };
    
    Plugin.prototype.close = function(){
        var $this = this;
        if ($this.btn.hasClass(prefix+'_open')) {
            $this._menuToggle();
        }
    };
    
    $.fn[mobileMenu] = function ( options ) {
        var args = arguments;

        // Is the first parameter an object (options), or was omitted, instantiate a new instance
        if (options === undefined || typeof options === 'object') {
            return this.each(function () {

                // Only allow the plugin to be instantiated once due to methods
                if (!$.data(this, 'plugin_' + mobileMenu)) {

                    // if it has no instance, create a new one, pass options to our plugin constructor,
                    // and store the plugin instance in the elements jQuery data object.
                    $.data(this, 'plugin_' + mobileMenu, new Plugin( this, options ));
                }
            });

        // If is a string and doesn't start with an underscore or 'init' function, treat this as a call to a public method.
        } else if (typeof options === 'string' && options[0] !== '_' && options !== 'init') {

            // Cache the method call to make it possible to return a value
            var returns;

            this.each(function () {
                var instance = $.data(this, 'plugin_' + mobileMenu);

                // Tests that there's already a plugin-instance and checks that the requested public method exists
                if (instance instanceof Plugin && typeof instance[options] === 'function') {

                    // Call the method of our plugin instance, and pass it the supplied arguments.
                    returns = instance[options].apply( instance, Array.prototype.slice.call( args, 1 ) );
                }
            });

            // If the earlier cached method gives a value back return the value, otherwise return this to preserve chainability.
            return returns !== undefined ? returns : this;
        }
    };
}(jQuery, document, window));
